describe "The -n command line option" do
  before :each do
    @names  = fixture __FILE__, "names.txt"
  end

  it "runs the code in loop conditional on Kernel.gets()" do
    ruby_exe("puts $_", :options => "-n", :escape => true,
                        :args => " < #{@names}").should ==
      "alice\nbob\njames\n"
  end

  it "only evaluates BEGIN blocks once" do
    ruby_exe("BEGIN { puts \"hi\" }; puts $_", :options => "-n", :escape => true,
                                               :args => " < #{@names}").should ==
      "hi\nalice\nbob\njames\n"
  end

  it "only evaluates END blocks once" do
    ruby_exe("puts $_; END {puts \"bye\"}", :options => "-n", :escape => true,
                                            :args => " < #{@names}").should ==
      "alice\nbob\njames\nbye\n"
  end

  it "allows summing over a whole file" do
    script = <<-script
    BEGIN { $total = 0 }
    $total += 1
    END { puts $total }
    script
    ruby_exe(script, :options => "-n", :escape => true,
                     :args => " < #{@names}").should ==
      "3\n"
  end
end
